Electric-arc lamp.



N0. 635,629. Patented Oct. 24, I899.

- F. S; WORSLEY.

ELECTRIC ARC LAMP.

(Application am Nov. 22, 1897.) (No Model.)

INVENTOFK FREDERIG S. Woasuzv UNITED STATES PATENT rrrcn,

FREDERIC S. IVORSLEY, OF LONDON, ENGLAND, ASSIGNOR TO THE BRITISH BLAIINIK ARC LIGHT COMPANY, LIMITED, CE SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 635,629, dated October 24, 1899.

Application filed November 22, 1897. Serial No. 659,458- (llo model.)

To (ti/l whom it may concern:

Be it known that I, FREDERIC STANHOPE \VORSLEY, electrical engineer, a subject of the Queen of Great Britain and Ireland, re-

siding at 119 Church Lane, Charlton, London,

in the county of Kent, England, have invented certain Improvements in Electric-Arc Lamps, of which the following is a specification.

This invention has for its principal object to provide simple and efficient means for controlling the feed of the carbons of electric-arc lamps.

According to this invention there is provided an arm or lever or its equivalent which can turn, preferably, but not necessarily, on the same center as, but independently of, the wheel or its equivalent which operates to effeet the striking of the arc and the feeding of the carbons. This arm or lever is connected with the magnetic or electric controlling device of the lamp, and the said arm or lever carries a part which forms with the said wheel a receptacle in which is contained a wedgingpiece which acts by bearing more or less upon a gripping-surface on or connected with the said wheel or its equivalent to move it at the proper times, the grip of the said wedgingpiece on the wheel or its equivalent being sufo ficiently released by a device which acts on the wedging-piece at the proper time.

The accompanying drawings illustrate the application of this invention to a lamp of the shunt type; but it is to be understood that 5 the invention is not limited to this type of lamp.

Figure 1 is a side elevation of the lamp; and Figs. 2 and 3 show, drawn to a larger scale, respectively, a side elevation, partly in section, and a plan of the parts which are provided in accordance with this invention. The pulley or wheelA, through which the adjustment of the carbon or carbons is shown as being effected by means of acord, as usual,

is provided with a gripping-surface]; shown as being formed by the grooved periphery of a wheel fixed on the same axis as the wheel A, adjacent to which gripping-surface is an arm or projection or the like 0, carried at one end of a lever C or frame or like device pivoted either on the same axis as the wheel A,

as shown, or slightly eccentricall'y thereto. The face of the arm or projection 0 presented toward the grippingsurface of the wheel B is preferably inclined, and between this face and the said gripping-surface there is provided a loose brake-block, which may be of taper, cylindrical, or other suitable form, and

it may be made of or be provided with a facing of india-rubber or other material adapted to afford the necessary grip on the grippingsurface. In the drawings the said brakeblock is presumed to be made of a metal holder (1, undercut to hold a pad of rubber (Z The operation of the rocking lever C is controlled by an electromagnetic or electric device which may be connected in any desired manner with the electric circuit through the lamp-carbons. In the drawings a solenoid-coil E is shown in shunt with the circuit through the lamp, the core 6 of the solenoid being connected by the slot-and-pin connection shown with the lever C at the end opposite to that which acts on the aforesaid brake -block. \Vhen the carbons are too far apart, the electric current, which then passes through the said solenoid-coil E, attracts its core e, so that it is drawn up, and it acts on the lever C so as to lower the other end of the said lever, at which the brake-block is situated, so that the So grip of the said brake-block on the said wheel 13 is reduced by reason of its coming in con-- tact with the tripper f, and the wheel A, secured to the same axis, can turn so that the carbons approach each other, and when the carbons are too close together the current in the solenoid E is reduced and allows the core to descend to a certain extent, and this lowers the end of the lever C to which it is connected and raises the other end, so that the projec- 0 tion 0 011 the lever C bears on the brake-block, which in turn bears on the wheel B with a sufficient grip to turn it, so that the wheel A is also turned in the direction necessary to cause the carbons to be moved apart. The 5 apparatus acts similarly in striking the arc. At the required part of the operation by which the carbons are caused to approach each other the grip of the brake-block on the periphery of the wheel B is lessened to the requisite extent by the tripping device f, which may take any suitable form-such, for

example, as a cord or chain of the proper length, by which the brake block is suspended, or a stop, such as the screw f, presented in the path of the said brake-block, the said device at the proper time arresting the movement of the brake-block, and thus causing its gripping power to be lessened, so as to allow the carbons to approach each other freely. The arm or projection c or the brakeblock may be provided with antifriction-rollers (for example, as shown at 0 for facilitating the movement of the brake-block and of the lever C in relation thereto. The operative face of the arm or projection (in the case shown, the said face is constituted by the rollers 0 need not be inclined when a Wedge or equivalently-shaped brakeblock is employed or when the said arm or projection is of sufiicient length or extent or is so shaped or arranged as to allow a cylindrical brakeblock to engage with the gripping-surface above, say, the horizontal center line of the above-mentioned wheel.

Fig. 4 is a side elevation, Fig. 5 is an end View with the wheel B partly in section, and Fig. 6 is a horizontal section, of a modification wherein the parts which correspond in their functions with those hereinbefore described are marked with the same letters of reference. The wheel 13 is made with a recessed part Z), in which is suspended by a cord from the depending wire f a wedging-piece, consisting of metal pieces (Z, hinged together, and they may be provided wit-h rubber facings at- (Z The lever O carries a pin 0 which enters between the hinged parts (Z, so as to force them apart to cause the wedging device to bear on the sides of the recessed part I) and operate as described with regard to the wedging-piece in thepreeeding arrangement. In place of a wheel 13 a vertical rod, similarly provided with a recessed part and connected with the carbon-holder, can be used.

This invention is not limited to the particular details described, as they may be varied, and the invention may be applied to lamps other than such as are constructed as shown in the drawings. For example, one only of the carbons may be movable, and the friction-wheel may operate the carbon or carbons through a rack and pinion in place of a cord, and the electromagnetic or electric controlling device may be duplicated, one being included in the main circuit and the other in a shunt therefrom, and both these may be at one end of the lever or one at one end and the other at the other end of the said lever to act on what is known as the differential system.

I claim as my invention 1. Means for regulating the feed of electric-arc-lamp carbons, comprising a controlling means, a wheel, a pivoted lever connected at one end to the controlling means, and carrying at the other end a projection and a loose brake-block wedge between the wheel and the projection, substantially as described.

2. The combination of the wheel of a feedregulating device for the carbons of an electric-arc lam p,with a pivoted brake-lever having rollers and a loose brake-block adapted to slide on said rollers, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FEE DE RIO S. W'ORSLEY.

\Vitnesses:

CHAS. MILLs, WILLIAM F. UPTON. 

